Drive comparison
ST4000DM004 vs WD40EZAX
Seagate BarraCuda 4TB and Western Digital WD Blue 4TB, compared using published manufacturer specifications.
Seagate
BarraCuda 4TB
ST4000DM004
SATA 6 Gb/s · 3.5-inch
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WD Blue 4TB
WD40EZAX
SATA 6Gb/s · 3.5-inch
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Amazon US · Used / renewed listing ↗ASIN B0CX5LX5GJ
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What differs between these models?
- Interface: ST4000DM004 lists SATA 6 Gb/s; WD40EZAX lists SATA 6Gb/s.
- Recording: ST4000DM004 lists SMR; WD40EZAX lists CMR.
A larger cache, higher RPM or higher advertised sequential speed alone does not establish which drive is better for your workload.
Specifications side by side
| Specification | ST4000DM004 | WD40EZAX |
|---|---|---|
| Manufacturer | Seagate | Western Digital |
| Product family | BarraCuda | WD Blue |
| Model number | ST4000DM004 | WD40EZAX |
| Capacity (TB) | 4 | 4 |
| Interface | SATA 6 Gb/s | SATA 6Gb/s |
| Recording | SMR | CMR |
| Cache (MB) | 256 | 256 |
| Form factor | 3.5-inch | 3.5-inch |
| Load/unload cycles | 600000 | Not recorded |
| Power-on hours per year | 2400 | Not recorded |
| Workload rating (TB/year) | 55 | Not recorded |
| Manufacturer limited warranty | 2 years (eligible new drives) | 2 years (eligible new drives) |
| RPM | Not recorded | 5400 |
| Physical sector size (bytes) | Not recorded | 4096 |
| Sustained transfer (up to MB/s) | Not recorded | 180 |
Compatibility and buying checks
- One or both drives use SMR recording. Check sustained-write and array requirements before choosing one for a NAS or a write-heavy workload.
- Compare new and renewed offers separately. The manufacturer specification does not guarantee the warranty or return policy of a marketplace seller.
Manufacturer sources
ST4000DM004
Seagate BarraCuda manufacturer specifications ↗ · pages 3
Reviewed 2026-09-07. Published specifications; no independent benchmark or failure-rate claim.
WD40EZAX
Western Digital WD Blue manufacturer datasheet ↗
Reviewed 2026-08-21. Published specifications; no independent benchmark or failure-rate claim.